While the black fob keeps the boost down to give you 500 horsepower, use the red one, and that supercharged 6.2-liter HEMI Hellcat engine will answer with 707 horsepower and 650 lb.-ft. of torque sent through the TorqueFlite eight-speed automatic.

Guess what happens to the rear wheels at that point...

Let's hope those Brembos can take the heat. Dodge says the Hellcat also a homage to a true Mopar classic:

The 2015 Dodge Challenger SRT Hellcat has been redesigned and totally re-engineered to be the most true-to-form muscle coupe on the market with performance-enhancing technologies inside and out, including the new TorqueFlite eight-speed automatic transmission and an all-new interior inspired by the classic 1971 Challenger.

Remember when the Viper's 640 horsepower V10 was a shocker? Well, Dodge's first factory supercharged HEMI just made the Challenger Hellcat the most powerful muscle car in history.